Dental swaging apparatus.



l110.889,085. PATENTED MAY 28,1908.

H. w. ALLWINE.

DENTAL SWAGING APPARATUS.

APPLICATION FILED NOV. 26, 1907.

Harry W -Hwne, lmmm.

HARRY W. ALLWINE, OF OMAHA, NEBRASKA.

DENTAL SWAGING APPARATUS.

Specification of Letters Patent.

Patented May 26, 1908.

Application led November 26, 1907. Serial No. L103,985.

To all 'whom it may concern:

Be it known that I, HARRY W ALLWINE, a citizen of the United States, and a resident of Omaha, in the Icounty of Douglas and State of Nebraska, have invented certain new and useful Improvements in Dental' Swaging Apparatus, of which the following is a specification. Y

My invention relates to apparatus for swaging metal plates for use in dentistry, and it is the object thereof to provide a strong and simple device of this character, by the use of which swaging operations may be performed with rapidity and accuracy.

Constructions embodying` my invention are illustrated in the accompanying drawings in which VFigure 1 is a sectional front elevation of the apparatus, Iiig. 2 is a sectional side elevation of the same, Iiigs. 3 and 4 are plan and side views, respectively, of the spacingblock, and Figs. 5 and 6 are plan and sido views, respectively, of the cover-plate.

In the construction shown I provide a screw-press comprising a base l. having integral standards 2 extending upwardly therefrom and curving inwardly at the top to unite with a collar 3, the said collar being internally threaded to receive' the screw 4 which at its upper end is provided with suitable handles 5 for turning the same. At the lower end of the screw 4 is an unthreaded cylindrical portion 6, the end of which is slightly rounded as indicated.

A cup 7 is provided, of a size adapted to easily inclose the largest plate'on which it is desired to operate. The cup is made preferably of cast-steel or other material of high tensile strength, adapting the same to withstand great internal pressures, the bottom being integral with the walls and having a small central aperture therein which is normally closed by a shouldered plug 8. The cup is smoothly finished inside and forms a cylinder in which is litted a piston 9 having a central aperture of relatively small area. The bottom of the piston is concave, the concavity extending to the edges thereof which are thereby made comparatively sharp. The cylindrical end portion 6 of the press-screw is made to lit snugly within the central aperture of the piston 9, whereby said portion 6 may act as a plunger for forcing plastic material through the aperture.

A spacing-block 10 is provided, the same being of the form shown in Figs. 3 and 4, and

being adapted to be placed. between the piston 9 and the collar 3 of the press-frame, the opening through the block corresponding with but being slightly larger than the central aperture of the piston. The cover-plate comprises a rectangular plate of metal, 11, having therein at one side near the end thereof a rounded depression, 12, adapted to lit the end of the plunger 6.

Inthe operation of the apparatus, a metallic model of the parts which the swaged plate is to fit, is made in the usual manner,

and said model is used as a die over which to swage the plate. The die A is placed on the bottom of the cup at about the center thereof, and the plate B which is to be swaged is placed over the same. rIhe plate B is then covered with pliable material, such as a sheet of soft leather, or rubber, or several thicknesses of cloth, or thin sheets of soft metal such as lead-foil. The cup is then filled with loose pieces or fragments of plastic material, such as paraffin, and the piston is started into the mouth of the cup. The cup and piston are then placed in the press, the coverplate 11 is placed over the aperture inthe piston, with the depression 12 under the end of the plunger 6, and the press-screw is turned down to force the piston into the cup. The fragments of plastic material, being thus subjected to pressure, the same are forced together into an `integral mass, flowing up through the central aperture as far as permitted by the cover-plate, as shown in Fig. 2. After the piston has been forced down far enough to permit the spacing block to be placed between the same and the collar 3 of the press-frame, the screw is turned up f slightly, the cover-plate is removed, and the spacing-block is set in position on top of the piston and around the aperture therein. The press-screw is then turned down until the plunger 6 enters the aperture in the piston and forces the plastic material therein down into the cup, after which the screw is again turned up'until the lower end of the plunger 6 is near the top of the spacing block. A further quantity of plastic material is then placed within the opening through the spacing block below the plunger 6 and, by screwing down the plunger, said material is forced down into the cup through the aperture in the piston. For convenience and to save time in the operation, the plastic material thus fed into the cup is preferably cast in the form of short cylinders O of a diameter the same as that of the plunger 6 and the aperture in the piston, as shown in Fig. 1. By using the cast cylinders of plastic material it is possible with one or two operations of the press-screw to feed sufficient material into the cylinder to enable the completion of the swaging operation. The upward pressure of-the plastic material on the piston is transmitted to the press-frame b y the spacing-block, and owing to the relatively small area of the plunger 6, the contents of the cylinder may be easily subjected to great pressure after the end of the plunger has entered the aperture and prevents escape o'l the plastic material through the same. After the swaging operation is completed, the cup and piston are removed from the press and the contents o'l.1A the cup are pressed out of the same by pushing the plug 8 inwardly.

New having described my invention, what l claim and desire to secure by Letters Patent is:

1. ln a device of the class described, the combination with a cylinder, and a piston Vfitting therein and having a central aperture of relatively small area, of a press having a plunger adapted to enter the aperture in the piston, and a removable spacing-block disposed between the piston and the presslrame to limit movement of the piston out of the cylinder, said spacing-block having a side opening through which materials may be placed below the plunger in position to be pressed' thereby into the aperture in the piston.

2. In a device of the class described, the combination with a cylinder, and a piston fitting therein and having an aperture of relatively small area, of a press having a plunger adapted to enter the aperture in the piston, a removable spacing-block disposed between the piston and the press-lirame to limit movement oi the piston out of the cylinder, and a removable cover-plate` adapted to close the aperture in the piston, the said cover-plate being engageable by the pressplunger to force the piston into the cylinder.

3. ln a device of the class described, the combination with a cylinder, and a piston iitting therein and having a central aperture ol relatively small area, of a press having a plunger adapted to enter the aperture in the piston, a removable cover-plate adapted to close the aperture in the piston, said coverplate being engageable by the press-plunger to drive the piston into the cylinder, and a removable spacing-block adapted to be disposed between the piston and the press-frame to limit outward movement of the piston, said spacing-block having an opening in the side thereof for the purpose described.

4. In a device for swaging dental plates, a cylindrical cup, a piston 'litting within said cup and having therein an aperture of relatively small area, a screw-press, a plunger carried by the press-screw and adapted to enter the aperture, plastic material 'lilling the cup, and a cylinder of plastic material adapted to enter the aperture in the piston, the piston and plunger being so arranged that the cylinder of plastic material may be placed between the plunger and the aperture and forced thereinto by movement of the press-screw.

In testimony whereof I have hereunto subscribed my name in the presence of two Witnesses.

HARRY YV. ALLWINE.

litnesses:

D. O. BARNELL, ROY G. KRATZ. 

